Earplug



FIG. 1 is a front perspective view of an earplug according to our new design;

FIG. 2 is a back perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a side elevational view thereof, the other sides being identical; and,

FIG. 5 is a bottom plan view thereof. 

The ornamental design for an earplug, as shown and described. 